140020_Design Narrative_v3.pdf

Design Narrative_v3_05/09/25

Design Narrative

REPLACE UNIT SUBSTATION & SWITCHGEAR, COL

V51, B3001

Project Number: WWYK140020 Work Order: 52142

Revision: 1

Tinker Air Force Base, Oklahoma

June 3, 2025

Prepared By:

Tepa Companies 7535 5th Street, Building 400

Tinker AFB, OK 73145

WWYK140020 - REPLACE UNIT SUBSTATION & SWITCHGEAR, COL V51, B3001

June 3, 2025 | i

CONTENTS

1. Overview

2. Applicable Codes and Standards

2.1 General

2.2 Civil

2.3 Architectural

2.4 Structural

2.5 Mechanical / Plumbing

2.6 Electrical

2.7 Fire Protection

3. Civil Design Narrative – N/A

4. Architectural Design Narrative

4.1 General Design Parameters and Assumptions

4.2 Architectural Demolition

4.3 Architectural Construction

5. Structural Design Narrative – N/A

6. Mechanical Design Narrative

6.1 Mechanical Demolition

6.2 Mechanical Construction

None, not applicable

7. Electrical Design Narrative

7.1 General Design Parameters and Assumptions

7.2 Electrical Demolition

7.3 Electrical Construction

8. Intrusion Detection System (IDS) Design Narrative – N/A

9. Access Control System (ACS) Design Narrative – N/A

10. Communications Design Narrative – N/A

11. Phasing Plan

APPENDICES

Appendix A: Acronyms and Abbreviations

Appendix B: Civil Calculations and Cutsheets

Appendix C: Architectural Calculations and Cutsheets

Appendix D: Structural Calculations and Cutsheets

Appendix E: Mechanical / Plumbing Calculations and Cutsheets

Appendix F: Electrical Calculations and Cutsheets

Appendix G: Fire Protection Calculations and Cutsheets ii | June 3, 2025

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1. Overview The existing transformer located on a platform at post V51 in Building 3001 needs to be replaced.

The Mezzanine-level gear accompanying the transformer (primary switch and secondary side switchgear) has outlived its expected life expectancy and will be replaced along with the 600V feeder cables to the 480V busses. The primary cables feeding the transformer from the switch located at Post P53. shall be demolished and a new run of 12.47kV cable shall feed the new primary side switchgear via the V51 switch. Failure of this substation has removed redundant capacity for this part of Building 3001. A second means of egress will also have to be installed, likely on the South-West side of the platform, but final location shall be coordinated with User.

2. Applicable Codes and Standards

2.1 General

ICD/ICS 705 Technical Specifications for Construction and Management of Sensitive Compartmented Information Facilities

IBC International Building Code (as amended by UFC 1-200-01) IEBC International Existing Building Code NFPA 101 Life Safety Code TAFB Facility Standard UFC 1-200-01 DoD Building Code UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings UFC 4-010-05 Sensitive Compartmented Information Facilities Planning, Design, and Construction

2.2 Civil

FAA Advisory Circular 150/5340-1L BASH Manual UFC 3-201-01 Civil Engineering UFC 3-230-01 Water Storage, Distribution, and Transmission UFC 3-250-01 Pavement Design for Roads and Parking Areas UFC 3-260-01 Airfield and Heliport Planning and Design UFC 3-260-02 Pavement Design for Airfields UFC 3-260-04 Airfield and Heliport Marking UFC 4-022-02 Security Fences and Gates

2.3 Architectural

ABA Architectural Barriers Act Standards UFAS Uniform Federal Accessibility Standards UFC 3-101-01 Architecture UFC 3-110-03 Roofing

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UFC 3-120-10 Interior Design UFC 3-190-06 Protective Coatings and Paints OSHA 1910.29(b) Guard Rail Systems OSHA 1910.29(b)(13) Swing gates OSHA 1917.112 Toe Boards OSHA 1917.118(d) Fixed Ladder Specifications UFC 3-201-02 Landscape Architecture

2.4 Structural

ACI 318-14 Building Code Requirements for Structural Concrete and Commentary

AISC 360-10 Steel Construction Manual, 14th Ed.

ASCE 7-10 Minimum Design Loads for Building and other Structures AISI S100-12 North American Specification for the Design of Cold-formed

Steel Structural Members UFC 3-301-01 Structural Engineering UFC 3-310-01 Seismic Design of Buildings

2.5 Mechanical / Plumbing

ANSI/ASHRAE/ Peak Cooling and Heating Load Calculations in Buildings Except ACCA Standard 183 Low-Rise Residential Buildings ASHRAE 55 Thermal Environmental Conditions for Human Occupancy ASHRAE 62.1 Ventilation for Acceptable Indoor Air Quality ASHRAE 90.1 Energy Standard for Buildings Except Low-Rise Residential

Buildings IECC International Energy Conservation Code IMC International Mechanical Code (as amended by UFC 3-410-01) IPC International Plumbing Code (as amended by UFC 3-420-01) TAFB Mechanical Standard UFC 1-200-02 High Performance and Sustainable Building Requirements UFC 3-400-02 Design: Engineering Weather Data UFC 3-401-01 Mechanical Engineering UFC 3-410-01 Heating, Ventilating, and Air Conditioning Systems UFC 3-410-02 Direct Digital Control for HVAC and Other Building Control

Systems UFC 3-410-04 Industrial Ventilation UFC 3-420-01 Plumbing Systems UFC 3-430-01FA Heating and Cooling Distribution Systems UFC 3-450-01 Noise and Vibration Control

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2.6 Electrical

ASHRAE 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings

NFPA 70 National Electrical Code NFPA 780 Standard for Installation of Lightning Protection Systems TAFB Electrical Standard UFC 3-501-01 Electrical Engineering UFC 3-520-01 Interior Electrical Systems UFC 3-530-01 Interior and Exterior Lighting Systems and Controls UFC 3-575-01 Lightning and Static Electricity Protection Systems AFMAN 32-1065 Grounding and Electrical Systems

2.7 Fire Protection

NFPA 1 Fire Code NFPA 10 Standard for Portable Fire Extinguishers NFPA 13 Standard for the Installation of Sprinkler Systems NFPA 51B Standard for Fire Prevention during Welding, Cutting, and Other

Hot Work NFPA 70 National Electric Code NFPA 72 National Fire Alarm Code NFPA 90A Standard for the Installation of Air-Conditioning and Ventilation

Systems NFPA 241 Standard for Safeguarding Construction, Alteration, and

Demolition Operations TAFB Fire Protection Standard DAFI 32-2001 Fire and Emergency Services (F&ES) Program UFC 3-600-01 Fire Protection Engineering for Facilities UFC 3-601-02 Operation and Maintenance: Inspection, Testing and

Maintenance of Fire Protection Systems UFC 4-021-01 Design and O&M: Mass Notification Systems

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3. Civil Design Narrative – N/A

4. Architectural Design Narrative The architectural requirements include removal, modification and reinstallation of guardrails from the receiver sleeves at the platform to accommodate the removal and installation of electrical and mechanical equipment. Ladders and handrails are to be painted and where mechanical items are removed, structural items are to be touched up with paint to match existing painted elements. The platform requires 2 fixed ladders to service the platform, one at the northwest corner on the west side of the platform and one on the southwest corner of the platform on the east side of the platform. There is an existing ladder on the west side of the platform. The ladder and all new ladders shall meet all requirements of current codes, base standards and regulations. The existing ladder is to be inspected for code compliance. Both ladders shall have a safety gate and a landing platform. Toe kick plates are to be installed between the guardrail receivers, with exception of the ladder opening locations. All ladders, guard rails and safety gates are to have a Safety Yellow finish. Barriers are to be installed to contain FOD and protect the area below and around the platform.

4.1 General Design Parameters and Assumptions

4.2 Architectural Demolition

4.2.1 To accommodate removal of the existing switchgear/associated transformer section equipment and installation of the new switchgear/associated transformer section, remove the existing guard rails along the east side of the platform. Store removed guardrails on-site for reinstallation. Guardrail receiver sleeves shall remain in place. At the south end, on the east side of the platform, modify the guard rail to accommodate access to a new ladder system down to the main floor.

4.3 Architectural Construction

4.3.1. Designer of Record shall verify all field dimensions.

4.3.2. Barriers are to be installed to contain FOD and protect the area below and around the platform.

4.3.3. After placement of the new switchgear & associated transformer Section on the platform, reinstall guard rails.

4.3.4. At the south end, on the east side of the platform, modify the guard rail to accommodate access to a new ladder system down to the main floor. Attach the remaining southeast corner post to the guard rail along the south side of the platform with new top and mid rails.

4.3.5. At the existing ladder on the west side of the platform inspect the ladder for code compliance. Both ladders shall have a safety gate and a landing platform and shall meet all requirements of current codes, base standards and regulations.

4.3.6. Install new safety gates at each platform ladder opening. Openings on platforms are regulated by OSHA paragraphs of §1910.23. OSHA paragraph §1910.23(a) covers floor openings, including access openings at the edge of a platform. The governing requirement is OSHA 1910.23(a)(2).

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4.3.7. Install new steel “Toe Boards” between the guardrail receivers per OSHA 1917.122(d) at perimeter of platform for the full length of the guard rails, excluding openings for ladder access entry at the safety gates.

4.3.8. Prior to final installation of the guardrails all ladders, guardrails and safety gates are to have a Safety Yellow finish.

4.3.9. Where mechanical items are removed, structural items are to be touched up with paint to match existing painted elements.

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5. Structural Design Narrative – N/A

6. Mechanical Design Narrative Switchgear to be repaired by replacement of same capacity.

Based on the information above, a LCCA was not performed for this project.

6.1 Mechanical Demolition

Demolish two steam condensate tanks on South side of Column W51. Demolish steam piping from units to high horizontal piping that is not in service. Demolish condensate piping from units to vertical IW piping. Replace vertical pipe fittings with new pups with similar material and fittings as existing. Demolish metal members supporting tanks and associated platform.

6.2 Mechanical Construction

None, not applicable.

7. Electrical Design Narrative The electrical requirements for the project include (but are not limited to):

Demolition of existing transformer, tie switch, and secondary side switchgear atop Mezzanine at Post V51

Demolition of primary cable feeders from the switch located at Post P53 to existing tie switch

Demolition of 600V branch circuits from secondary side switchgear to 480V busses Installation of new Transformer, tie switch, and secondary side switchgear Installation of cable feeders from V51 switch to existing switch at Post P53 Installation of 600V branch circuits from secondary side switchgear to 480V buses Installation of Circuit Breaker lifting hoist for switch gear.

Installation of portable and corded remote racking/switch station.

7.1 General Design Parameters and Assumptions

Existing equipment is located on Mezzanine at Post V51in building 3001. The primary side switchgear (tie switch) is powered via switch located at Post P53 (Circuit 24B to V51 – normally closed), is a 3-phase 12470V. The 1000kVA transformer reduces the voltage from 12470V to 480/277V which is then fed through the secondary side switchgear which routes the power to the North & South Bus. The Mezzanine contains the switchgear and transformer slotted for replacement.

Phasing of electrical demolition and installation shall be taken into consideration in both the design and construction phases. All work should aim to minimize disruption to user production output. Construction can occur during normal work hours. Outages must be coordinated with user 21 days in advance and must occur during non-standard working hours, weekends and holidays. Additionally, any work that will require the main aisle to be blocked will need to be done after hours or on weekends or holidays.

Contractor shall perform Voltage Drop calculations for all branch circuits that have excessive lengths; circuit showing excessive voltage drop will be replaced. New branch circuits for this

8 | June 3, 2025 project will not exceed the maximum allowable length and will not produce excessive voltage drop.

7.2 Electrical Demolition

All switchboard and transformer requirements shall be verified in field. De-energize and disconnect 12.47kV cable feeding relevant equipment. During the demolition and installation of gear, the South bus shall be fed from platform V67 equipment, and the North bus shall be fed from platform V91-1 equipment.

The existing primary side switchgear (12.47kV), 1000kVA transformer, and secondary side switchgear (480/277V) shall be demolished. All cable feeding the existing primary side switchgear from switch located at Post P53 shall be demolished along with the 600V branch circuit cables extending from the secondary side switchgear to the North and South 480V bus tap boxes. This includes the Tie Switch and secondary side of the switchgear.

7.3 Electrical Construction

New 3-phase/12.47kV/480V switchgear shall include 1600A main breaker, metering stations (ION 8650 metering stations connected to the CE Community of Interest Network Enclave (COINE) Virtual LAN per Tinker AFB Electrical Standards) and have arc flash prevention in the forms of both remote racking and remote switching. The new Switchgear shall have 1600 A adjustable-trip breaks to feed existing North and South bus feeds. As well as having one (1) spare space for additional future expansion. New switchgear shall include spare 1600A adjustable-trip breaker allowing for redundancy IAW Tinker AFB Standards.

New 1000kVA transformer shall be equipped with a cooling fan and appropriate ventilation.

A new run of 12.47kV cable from the V51 spare switches (located on same platform) to primary side switchgear and P53 and 600V cable from secondary side switchgear to North and South cable tap boxes shall be installed.

Designer is to provide an electrical distribution coordination study for the relevant equipment, as well as a fault current analysis and arc flash calculations (with detailed labels for all new equipment installed under this contract), which shall be performed using Easy Power software. Available fault current at the secondary terminals shall be provided for the new transformer.

A remote-control cabinet shall be installed and located on the plant floor: Purpose is to function as on installed at Post V67.

Ensure a circuit breaker lifting hoist is part of switchgear.

Provide portable and corded remote racking /switch station for the switchgear is required.

New branch circuits shall be supplied from the secondary side switchgear to the North and South bus Cable tap boxes.

Fire Protection / Life Safety Design Narrative – N/A

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8. Intrusion Detection System (IDS) Design Narrative – N/A

9. Access Control System (ACS) Design Narrative – N/A

10. Communications Design Narrative – N/A

11. Phasing Plan

Contractor shall coordinate with Civil Engineering/TEPA to schedule any outages or main aisle blockages. While under construction, North and South buses shall be fed from North Substation V91-1 and South Substation V 69, respectively to minimize the impact to production.

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Appendix A Acronyms and Abbreviations

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A Ampere(s)

AABC Associated Air Balance Council

ACCA Air Conditioning Contractors Association

ACI American Concrete Institute

ACS Access Control System

ACT Acoustic Ceiling Tile

AFB Air Force Base

AFF Above Finished Floor

AFI Air Force Instruction

AHJ Authorities Having Jurisdiction

AHU Air Handling Unit

AISC American Institute of Steel Construction

ANSI American National Standards Institute

ASCE American Society of Civil Engineers

ASHRAE American Society of Heating, Refrigeration and Air-Conditioning Engineers

ASTM American Society for Testing and Materials

BTHU British thermal unit

BUR Built-Up Roof

CAC Common Access Card

CBT Computer Based Training

CCTV Closed Circuit Television

CIPS Cyberspace Infrastructure Planning System

CMU Concrete Masonry Unit

COMM Communications

DB Dry Bulb

DoD Department of Defense

DX Direct Expansion

E East

EBI Enterprise Building Integrator

EMI Electromagnetic Interference

EMT Electrical Metallic Tubing

FCI Fire Control Instruments

FCU Fan Coil Unit

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FF-L Federal Specification

FPS Feet Per Second

FT Feet

GSA General Services Administration

HR Hour(s)

HSS Hollow Structural Section

HVAC Heating, Ventilation and Air Conditioning

IAW In Accordance With

IBC International Building Code

IC Intelligence Community

ICD Intelligence Community Directive

ICS Intelligence Community Standard

IDS Intrusion Detection System

IEBC International Existing Building Code

IECC International Energy Conservation Code

IMC International Mechanical Code

IN Inches

IPC International Plumbing Code

IT Information Technology kVA Kilovolt-Ampere

LAN Local Area Network

LED Light Emitting Diode

MOD Motorized Damper

N North

NEBB National Environmental Balancing Bureau

NFPA National Fire Protection Association

NIPR Non-Secure Internet Protocol Router

PSF Pounds per Square Foot

RF Radio Frequency

RFI Radio-Frequency Interference

SIPR Secure Internet Protocol Router

SMACNA Sheet Metal and Air Conditioning Contractors' National Association

S South

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STC Sound Transmission Class

TAFB Tinker Air Force Base

UFC Unified Facilities Criteria

UPS Uninterruptible Power Supply

V Volts

VAV Variable Air Volume

W West

WB Wet Bulb

WG Water Gauge

§ Subsection

°F Fahrenheit

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Appendix B

Civil Calculations and Cutsheets

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Appendix C

Architectural Calculations and Cutsheets

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Appendix D

Structural Calculations and Cutsheets

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Appendix E

Mechanical / Plumbing Calculations and Cutsheets

Appendix F

Electrical Calculations and Cutsheets

Appendix G

Fire Protection Calculations and Cutsheets